lecture13 - Lecture13Outline Announcements...

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Lecture 13 Outline Announcements MT tomorrow night,  5-6:30pm,  Herrin T175. Regular HW this week Single-Sideband Modulation Vestigual-Sideband Modulation Noise in AM Systems Coherent Detection: The Phase Lock Loop
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Review of Last Lecture DSB-SC AM: Generation and Detection of DSB-SC Signals Amplitude Modulation )] ( ) ( [ 5 . ) 2 cos( ) ( ) ( c c c f f S f f S t f t m t s + + - = π s(t)= [A+m(t)] cos ϖ c t m(t) cos( ϖ c t+ φ 1 29 DSBSC Modulator s(t) DSBSC Modulator LPF m´(t) cos( ϖ c t+ φ 2 29 Channel Nonlinear
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Modulation Systems Power in s(t) is .5P m Power in m (t) is .25P (half the power in s(t)) Power in n (t) is .5N 0 B (PSD .25N 0  over BW 2B) SNR=P /P = P m /(2N 0 B)= P s /(N 0 B) Similar calculation for standard AM, SSB DSBSC/AM Demod m´(t)+ n´(t) cos( ϖ c t+ φ29 s(t)=m(t)cos( ϖ c t+ φ29 + n(t) LPF 1 White Gaussian noise (AWGN), PSD N 0 /2 -B B
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lecture13 - Lecture13Outline Announcements...

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